package com.hjieli.utils;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Random;

/*对图片进行处理的类和方法*/

public class VerifyCode {

	public static String drawRandomText(int width, int height, BufferedImage verifyImg) {
		Graphics2D graphics = (Graphics2D) verifyImg.getGraphics();
		graphics.setColor(Color.WHITE);// 设置画笔颜色-验证码背景色
		graphics.fillRect(0, 0, width, height);// 填充背景
		graphics.setFont(new Font("微软雅黑", Font.BOLD, 40));
		// 数字和字母的组合
		String baseNumLetter = "123456789abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";

		StringBuffer sBuffer = new StringBuffer();
		int x = 10; // 旋转原点的 x 坐标
		String ch = "";
		Random random = new Random();
		for (int i = 0; i < 4; i++) {
			graphics.setColor(getRandomColor());
			// 设置字体旋转角度
			int degree = random.nextInt() % 30; // 角度小于30度
			int dot = random.nextInt(baseNumLetter.length());
			ch = baseNumLetter.charAt(dot) + "";
			sBuffer.append(ch);
			// 正向旋转
			graphics.rotate(degree * Math.PI / 180, x, 45);
			graphics.drawString(ch, x, 45);
			// 反向旋转
			graphics.rotate(-degree * Math.PI / 180, x, 45);
			x += 48;
		}
		// 画干扰线
		for (int i = 0; i < 6; i++) {
			// 设置随机颜色
			graphics.setColor(getRandomColor());
			// 随机画线
			graphics.drawLine(random.nextInt(width), random.nextInt(height), random.nextInt(width),
					random.nextInt(height));
		}
		// 添加噪点
		for (int i = 0; i < 30; i++) {
			int x1 = random.nextInt(width);
			int y1 = random.nextInt(height);
			graphics.setColor(getRandomColor());
			graphics.fillRect(x1, y1, 2, 2);
		}
		return sBuffer.toString();
	}

	/**
	 * 随机取色
	 * 
	 */
	private static Color getRandomColor() {
		Random ran = new Random();
		Color color = new Color(ran.nextInt(256), ran.nextInt(256), ran.nextInt(256));
		return color;
	}
}